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17 Cards in this Set
- Front
- Back
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Atom
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the smallest unit of an element that maintains the properties of that element.
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Element
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a substance that cannot be separated or broken down into simpler substances by chemical means.
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Nucleus
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in physical science, an atom's central region, which is made up of protons and neutrons.
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Proton
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a subatomic particle that has a positive charge and that is found in the nucleus of an atom.
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Neutron
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a subatomic particle that has no charge and that is found in the nucleus of an atom.
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Electron
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a subatomic particle that has a negative charge.
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Atomic Number
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the number of protons in the same nucleus of an atom; the atomic number is the same for all atoms of an element.
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Atomic Mass
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the mass of an atom expressed n atomic mass units.
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Mass Number
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the sum of the numbers of protons and neutrons in the nucleus of an atom.
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Atomic Mass Unit
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a unit of mass that describes the mass of an atom or molecule.
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Electron Cloud
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a region around the nucleus of an atom where electrons are likely to be found.
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Periodic Table
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describes something that occurs or repeats at regular intervals.
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Isotope
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an atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons.
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Energy Level
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The fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.
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Bohr Model
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In atomic physics, the Bohr model, devised by Niels Bohr, depicts the atom as a small, positively charged nucleus surrounded by electron.
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Rutherford Experiment and model
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Sir Ernest, 1st Baron Rutherford of Nelson (1871–1937), New Zealand physicist, regarded as the founder of nuclear physics. Nobel Prize.
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Thompson Model
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The plum pudding model of the atom by J. J. Thomson, who discovered the electron in 1897, was proposed in 1904
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